Feasibility of recycling sewage sludge ash in ultra-high performance concrete: Volume deformation, microstructure and ecological evaluation

Gu, Chengfan; Ji, Yongjie; Yao, Jikai; Yang, Yang; Liu, Jintao; Ni, Tongyuan; Zhou, Hangjie; Tong, Yunyun; Zhang, Xuefeng

doi:10.1016/j.conbuildmat.2021.125823

Cited by 21 publications

(2 citation statements)

References 61 publications

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“…The ash from the incineration of the discussed type of sludge can replace even 10% of cement, but on the other hand, it can modify its characteristics. In particular, it refers to the values of parameters such as volume deformation or early age cracking risk [ 26 ]. In another study, various shares of ash from sewage sludge combustion in the range of 5–25% by mass were verified, confirming acceptable values of such operational parameters of the product as, for example, compressive strength of concrete [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Innovative Technological Approach for the Cyclic Nutrients Adsorption by Post-Digestion Sewage Sludge-Based Ash Co-Formed with Some Nanostructural Additives under a Circular Economy Framework

Sakiewicz

Piotrowski

Rajca

et al. 2022

IJERPH

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This paper presents a new, innovative technological approach, in line with Circular Economy principles, to the effective management of sludge generated during municipal wastewater treatment processes and subsequently used for biogas production. This approach allows for optimal, functional, and controlled cascade-type biotechnological thermal conversion of carbon compounds present in sewage sludge, later in solid digestate residues (after biogas production), and finally in the ash structure (after incineration, purposefully dosed nanostructural additives make the production of a useful solid product possible, especially for cyclic adsorption and slow release of nutrients (N, P, K) in the soil). The idea is generally targeted at achieving an innovative conversion cycle under a Circular Economy framework. In particular, it is based on an energy carrier (methane biogas) and direct energy production. The functionalized combustion by-products can be advantageous in agriculture. The use of ashes with nanostructural additives (halloysite, kaolinite) from combustion of sewage sludge after the anaerobic fermentation as an adsorbent of selected nutrients important in agriculture (Na+, K+, NO3−, SO42−, PO43−, Cl−) was verified at laboratory scale. The tests were carried out both for pure ash and for the ash derived from combustion with the purposeful addition of kaolinite or halloysite. The equilibrium conditions for nitrate, potassium, sodium, phosphate(V), sulphate(VI), and chloride ions from aqueous solutions with the use of the three adsorbent structures were determined. The obtained innovative results were interpreted theoretically with adsorption isotherm models (Langmuir, Freundlich, Temkin, Jovanović). The most spectacular and clearly favorable results related to the influence of nanostructural additives in the process of sludge combustion, and formation of sorption surfaces under high temperature conditions were identified in the case of sorption-based separation of phosphate(V) ions (an increase from 1.13% to 61.24% with the addition of kaolinite, and even up to 76.19% with addition of halloysite).

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Section: Introductionmentioning

confidence: 99%

Innovative Technological Approach for the Cyclic Nutrients Adsorption by Post-Digestion Sewage Sludge-Based Ash Co-Formed with Some Nanostructural Additives under a Circular Economy Framework

Sakiewicz

Piotrowski

Rajca

et al. 2022

IJERPH

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“…The incorporation of SF, FA and GGBS can effectively reduce the amount of cement, significantly improve the strength and durability of UHPC, and improve the flowability of UHPC. However, with the wide application of UHPC, the consumption of these industrial by-products is increasing, leading to an oversupply, degradation in quality and high prices [ 17 , 18 , 19 ]. Therefore, the preparation of UHPC with composite materials [ 20 , 21 ] or solid waste [ 22 , 23 , 24 ] instead of partial cement has become a new research direction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shale Powder on the Performance of Lightweight Ultra-High-Performance Concrete

Guo

Ding

2022

Materials

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In this study, lightweight ultra-high-performance concrete (L-UHPC) was prepared by using SP to replace part of the cement. The main study investigated the effect of the amount of SP on the spread diameter, apparent density and mechanical properties of L-UHPC. The mechanism of the effect of SP on the hydration product of L-UHPC was studied and the pore structure of L-UHPC was also analyzed. The results show that the incorporation of SP can effectively improve the spread diameter and reduce the apparent density of L-UHPC to a certain extent. With the increase in SP content, the compressive strength of L-UHPC at 7 days of age did not change significantly. However, the compressive strengths at 3 and 28 days of age changed significantly. When the amount of SP was less than 12%, there was no significant decrease flexural and compressive strength at 28 days of age. However, the flexural and compressive strength of L-UHPC gradually decreased when the amount of SP was greater than 12%. The microstructure shows that SP can reduce the content of portlandite. This is mainly due to the fact that the addition of SP improved the stacking compactness of L-UHPC and promoted secondary hydration reactions. The content of portlandite and the hydration degree of cement were reduced. At the same time, the exothermic hydration of L-UHPC with SP was less, the hydration process was slow, and the exothermic rate of initial hydration was low. An appropriate amount of SP can effectively improve the pore structure of L-UHPC and significantly reduce the pore volume of harmful pores (50~200 nm). SP can make the L-UHPC structure more compact and has a positive effect on the development of L-UHPC strength.

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Characterizing Sewage Sludge Ashes in Dry and Wet States for Use as SCM

Shehadeh,

Govin,

Grosseau

et al. 2023

RILEM Bookseries

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Feasibility of recycling sewage sludge ash in ultra-high performance concrete: Volume deformation, microstructure and ecological evaluation

Cited by 21 publications

References 61 publications

Innovative Technological Approach for the Cyclic Nutrients Adsorption by Post-Digestion Sewage Sludge-Based Ash Co-Formed with Some Nanostructural Additives under a Circular Economy Framework

Innovative Technological Approach for the Cyclic Nutrients Adsorption by Post-Digestion Sewage Sludge-Based Ash Co-Formed with Some Nanostructural Additives under a Circular Economy Framework

Effect of Shale Powder on the Performance of Lightweight Ultra-High-Performance Concrete

Characterizing Sewage Sludge Ashes in Dry and Wet States for Use as SCM

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